//
//  DrawerViewController.m
//  LO_MUSIC
//
//  Created by lanou3g on 16/2/24.
//  Copyright © 2016年 杨少锋. All rights reserved.
//

#import "DrawerViewController.h"

@interface DrawerViewController ()<UIGestureRecognizerDelegate>

@end

@implementation DrawerViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor whiteColor];
//    添加子视图控制器
//    [self addChildViewController:self.leftVC];
//    [self addChildViewController:self.rootVC];
    
//    如果没有手势
    if (!self.tap) {
        
        self.tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapAction)];
        [self.tap setEnabled:NO];
        self.tap.delegate = self;
        [self.view addGestureRecognizer:self.tap];
    }


}


//设置中间视图控制器
-(void)setRootViewController:(UIViewController *)viewcontroller{
//   如果传进来的viewcontroller是空的直接返回
    if (!viewcontroller) {
        return;
    }
    
//    设置中间视图控制器
    [self.rootVC.view removeFromSuperview];
    self.rootVC = viewcontroller;
    [self addChildViewController:viewcontroller];
//    如果手势交互开着，证明抽屉是打开的
    if (self.tap.enabled) {
        viewcontroller.view.frame = CGRectMake(200, 0, 375,667);
    }
    [self.view addSubview:viewcontroller.view];
    
//    关闭抽屉
    [self showRootViewcontroller:nil];
//    设置导航栏
    [self setNaButton];
    
    
}

//展示中间视图的方法（关闭抽屉）
-(void)showRootViewcontroller:(UIViewController *)viewcontroller{
    [UIView animateWithDuration:0.4 animations:^{
        self.rootVC.view.frame = CGRectMake(0, 0, 375, 667);
    }];
    
//    手势关闭
    [self.tap setEnabled:NO];
//    rootview交互打开
    self.rootVC.view.userInteractionEnabled = YES;
}

//打开抽屉
-(void)showleftViewController:(UIViewController *)leftViewController{
    
    if (![self.view.subviews containsObject:self.leftVC.view]) {
//        插入抽屉的view
        [self.view insertSubview:self.leftVC.view atIndex:0];
    }
    
//    动画移动根视图控制器
    [UIView animateWithDuration:0.4 animations:^{
        self.rootVC.view.frame = CGRectMake(200, 0, 375, 667);
    }];
    
    //    手势打开
    [self.tap setEnabled:YES];
    //    rootview禁止使用
    self.rootVC.view.userInteractionEnabled = NO;
    
    
    
}


//设置左上角按钮
-(void)setNaButton{
    UINavigationController *na = (UINavigationController *)self.rootVC;
    UIViewController *vc = na.viewControllers[0];
    vc.navigationItem.leftBarButtonItem = ({
        UIBarButtonItem *item = [[UIBarButtonItem alloc]initWithTitle:@"抽屉" style:(UIBarButtonItemStyleDone) target:self action:@selector(openMenu)];
        item;
    });
}

//打开抽屉

-(void)openMenu{
    
    [self showleftViewController:nil];
    [self.tap setEnabled:YES];
    self.rootVC.view.userInteractionEnabled = NO;
    
}

//
-(void)tapAction{
//    关闭抽屉
    [self showRootViewcontroller:nil];
    [self.tap setEnabled:NO];
    self.rootVC.view.userInteractionEnabled = YES;
}

//代理方法
-(BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer{
    if (gestureRecognizer == self.tap) {
        return CGRectContainsPoint(self.view.frame, [gestureRecognizer locationInView:_rootVC.view]);
    }
    return YES;
}








- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end
